Discusses the implementation of an assessment program for subject specialists liaison librarians at the University of Maryland. The framework for the subject specialists liaison librarianship at the University of Maryland was put in place in 2014. 2015 was the first full annual review cycle under the new guidelines. The assessment program includes procedures for assessing the liaisons’ research services, collection development activities, teaching and learning services, scholarly communications and outreach and engagement activities. This paper will discuss practical steps towards implementation, outcomes, challenges, and successes of the new program.